Socket Client Problem

[Boriestw]

Hi everyone,

I have a problem for my new application on Windows Phone 7 & 8. I have a server on C# which create a socket listener and I want my Windows Phone app and my Windows 8 app connect to it to transfert some data between them.

My connection with my W8 app works, but the WP8 app throw a System.Net.Sockets.SocketError.ConnectionRefused.

I want to try on Windows Phone 7 but there are "no connection" so I have to try my app on my Lumia 800, but I think it will be the same error.

This is my code for the server C#:

 private void StartListener()
        {
            _listenerThread = new Thread(RunListener);
            _listenerThread.Start();
        }

        private void RunListener()
        {
            _listener = new TcpListener(IPAddress.Any, 12350);
            _listener.Start();

            while(true)
            {
                try
                {
                    TcpClient client = _listener.AcceptTcpClient();
                }
                catch (Exception) { }
            }
        }

Now the Windows Phone app:

           string result = string.Empty;
            IPAddress address = string.Empty;

            address = IPAddress.Parse("127.0.0.1");

            IPEndPoint endPoint = new IPEndPoint(address, 12350);

            // Create a stream-based, TCP socket using the InterNetwork Address Family. 
            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            // Create a SocketAsyncEventArgs object to be used in the connection request
            SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
            socketEventArg.RemoteEndPoint = endPoint;

            // Inline event handler for the Completed event.
            socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
            {
                // Retrieve the result of this request
                result = e.SocketError.ToString(); 

               // ------------------------------------------------------                            result equal to ConnectionRefused                      --------------------------------------------

                // Signal that the request is complete, unblocking the UI thread
                _clientDone.Set();
            });

            // Sets the state of the event to nonsignaled, causing threads to block
            _clientDone.Reset();

            // Make an asynchronous Connect request over the socket
            _socket.ConnectAsync(socketEventArg);

            // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
            // If no response comes back within this time then proceed
            _clientDone.WaitOne(TIMEOUT_MILLISECONDS);

            return result;
        }

An idea of what the problem is?

Thanks in advance.

[wizard_hu_]

127.0.0.1 is the localhost address, it means the same device which issues the connection request. The Windows 8 app can connect to the server, because it is running on the same Windows 8 machine. However even the emulator runs on a separate virtualized machine with a separate network stack. And if you try with a real phone, it is going to be more obvious that it is a completely separate machine.
So use the real IP address of your Windows 8 host. ipconfig is a command which can tell you your IP address(es), but it is probably available via the GUI too, just I am not too familiar with Windows 8 yet.

[Boriestw]

Hi,

It works with my IP adress !

My Windows Phone emulator runs on a separate virtualized machine with a separate network stack so I understand, but my Windows 8 app was also launched in emulator like the Windows Phone emulator but it worked with 127.0.0.1, strange.

Anyway, thank you very much!